Improved bolt-heading machine



I between its ends.

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gititci ,mes L ROBERT GRAcEiCHo'F PITTsBURG, PENNSYLVANIA.

\ I Lettms Pateat No. 83,376, dated Gotcha/r2?, 1868. l

:Mn-overl BOLT-HEADING meme.

` lThe Schedule referred to in these Letters Patent and-making parl: of the lama.

To all whom it may coiwerfn Beit lmown that I, ROBERT GRACEY, of the city of Plttsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new and useful Improveinent in Apparatus for Operating Bolt-Heading Dies; and I do hereby declare the following to be a full, clear, and exact description thereof, "reference being had to the accompanying drawing, making a part of this specification', in which- Figure l is a side elevation of my improved apparatus for operating bolt-heading dies, and

Figure 2 is an end elevation of the same. Like letters of reference indicate like parts in each. The nature of my invention consists', first, in the construction and combination of devices for operating by steam a weighted drop-beam, by which, through a toggle, the heading-die of a bolt, spikefor rivet-machine is operated; and, second, in combining with such devices, an adjustable bumper-head, so as thereby to regulate the length of stroke of the headingldie, and thus, without other adjustment of the machine, to make bolt-heads of different sizes.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

a single Iacting steam-cylinder, fitted with a piston,'of anyeonveuient construction, on the under side only of which steam is admitted, through' a single-acting slide-valve in the va1ve-chest d.

By a steam-pipe, n', steam is supplied to the valvechest d, andthe exhaust steam escapes fromthe cylinder A, by an exhaust-pipe, n, connected therewith' by suitable passages.

M is a shaft, resting inproperly-constructed bear; ings, and iitted with suitable gearing, through which power is communicated, to secure the motions presently to be described.

' l `Toy the arms d rlgattached to the valvelc'hest d, or `=to some other iixed object, the .levers a. a. are pivoted,

the former, a, by its extreme end, the latter, a', midway rlhe valve-stem c connects the slide-valve, in the valve-chest, with the levers a a', by 'which it is operated.

lhese levers a a are actuated by trippers l1 b, which are fastened to the shaft m, and revolve therewith.

. At each revolution, the tripper b engages the lever a, and gives the stern c and the slide-valve a downward throw. The tripperb next engages the lever a', and .raises the valve, the steam thus being admitted to the cylinder, to operate the piston therein, and then vbeing exhausted in the usual way.

At or near the opposite end of the machine (all the devices named being supported on any suitable frame or foundation, m) is a post, L, to the upper end of which, as a fulcrum, is pivoted the drop-beam F, which, in

turn, is .connected-to the piston, in the cylinder A, by a link, H.

B B are guides, playing vertically through guidea boxes h h, by which a vertical motion is secured to the piston.

On the forward end of the beam F are hung one or more weights, j, to increase the effectiveness of its downward percussive blow. v

Between the fulcrum-post L and cylinder A, the link G connects the beam F with the toggles K K', the latter, K', moving on a fixed point, at k, and the former, K, being attached to a heading-die, N.

To the bumper-posts E E, I attach the bumper-head J, and make it adjustable thereon by the nut o.

In a recess in this bumper-head is a cushion, D, of India rubber, or other yielding, elastic material.

AThe lower endl of such recess is closed by a piston,-

j, which is held in place by astem, e, passing through the cushion D and bumper-head J, and secured by a nut e.

By the revolution of the shaft M, the tripper b is brought against the lever a', moving thefslide-valve in the valve-chest (l, admittir'igsteam into the cylinder A, below the piston, forcing it and the drop-beam F upward, until the latter strikes the piston j .in the bumper-head J. This motion raises the linkG, and draws back the toggle K, and the'heading-die'N attached thereto. The iron for the bolt is then d in between suitably-shaped griping-dies, s, by which it is seized and securely held.

By the-continued revolution of the shaft M, the tripper b and lever a give the slide-valve a throw, in the opposite direction, and open1 the exhaust-port, when the steam escapes from below the piston, the weighteddrop-beam-F falls, the toggle Kforces theheading-die' or tool N backward, and upsets a head, x', on the end of the bolt x. The bolt is still held by the gripingdies, till the heading-tool N is withdrawn, when' it is discharged, the material for another bolt fed in, and the operation continued as before.

In order to make bolt-heads of' different sizes, I adjust the bumper-head J higher or lower, by the nuts o. By lowering this bumper-head J, the beam 'F has less motion, the toggle K and header N are drawn back a less distance, and consequently a less length of boltrod is fed in, and a head ofv smaller' size is formed.

'Io make a larger bolt-head, the. bumper-head J is raised, and the header N is drawn further back.

The header N of course should be changed for bolts of differentsized heads.

The trippers b b are so adjusted on the shaftMas to open the exhaust-port, when the drop-beamllstrkes the buinpercushion j, and also so as 'to close the eX- haust-port and admit steam, in time to cushion the piston when it comes down with the fall of *the dropbearn The steam-cylinder A, with the slide-valve, and the devices for operating it, may, ofcourse, have any desirable position relative to the drop-beam F, above or below, or at any `other point Where it will seeure sub-v Y stantially the same operation.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The weighted lever F, link G, and toggle-arms K and piston in steam-cylinder A, for regulating the throw of bolt-heading dies, substantially as and for the purposes hereinbefore set forth.

In testimony whereof, I, the said ROBERT GRACEY,

have hereunto set my hand.. v

, ROBERT GRACEY.

Witnesses ELL TORRANCE, G. H. CHRISTY. 

